Injector



Patented Oct. 2, 1934 JPruieiur OFFICE INJECTOR Erich Henkel, Calumet City, Ill., assignor to The Superheater Company, New York, N. Y,

Application August 2o, 1932, serial Nc. 629,621 13 Claims. (or. 10s- 271) The present invention relates to injectors and' has particular reference to injectors of the type in which the amount of water suppliedto the injector is governed by'varying the area of the opening for flow of water into the water nozzle or cone of the injector.

The invention is well suited to exhaust steam injectors of the Metcalfe type but it is to be understood that it is in no wise restricted in its application to any special type of injector.

The principal object of the invention is toy improve upon constructions heretofore employed for effecting Va variable water inlet opening at the water nozzle of the injector and to provide an injector having water regulating means of the above described general characterY in which the' construction is such that leakage f water to the steam chamber of the injector, as well as leakage of steam from the steam chamber to the water passages of the injector ahead of the water nozzle, is prevented without having to resort to the use of packing elements. Y t

Further and more detailed objects of the invention together with the advantages to be de rived from its use will be more fully set forth'in connection with the ensuing description 'of a preferred embodiment of theinvention as applied to an injector of the Metcalfe type. Y

n In the accompanying drawing forming a partv 0G of this specification; i Y

Fig. 1 is a longitudinal central section of an exhaust steam injector embodying the present invention and v Fig. 2 is a view showing a part ofthe structure of Fig. 1 on a larger scale and with arnovable element therein shown in part inone position and in part in a second position.

Referring now to the drawing, the injector `bodyindicated generally at A comprises casing portions 10 and 11 which, if desired, may obviously be:

made integral with each other. Casing portion 10 provides Ia main steam chamber 12 to which exhaust'steam is supplied through .the inlet 13' controlled by the exhaust valve 14. Valve 141is urged toward the closed position shown inv the figure-by spring 15 `and is opened by pressure fluid. such as live steam admitted to piston 164 through supply passage 17. The main steam nozzle 18 is removably secured in the body portion' 50. l() as by means of the threaded and iianged joint indicated at 19.. It will be evident that this'nozzle' may, if desired, be made integral with the casingcr may be fixed thereto in any suitable manner providing a fixed connection. As will hereinafter more fully appear, it is desirable in connecmain steam chamber 12 and the water nozzle o-r 5 cone 20 to which water is supplied by way of inlet conduit 21 and water chamber 22. In the specific form of injector illustrated a secondary steam nozzle 23 is employed, steam being conducted from chamber 12 to chamber 24- through a passage at the side of the injector, not shown in the drawing.

- In the casing portion 11 are mounted the combining tube-25 and delivery tube 26, which may loeV of any suitable form, the chamber 27 around the combining tube being in communication with the usual overflow outlet 28 and the delivery tube 26 being in communication through the usual check valve 29 with the delivery conduit 30.

Y'1n order to enable the injector to deliver against high pressures, a nozzle is provided to which supplementary high pressure Vlive steam is admitted by way of chamber 32 and in order to permit the injector to operate when exhaust steam is not available, live steam at reduced pressure is admitted to chamber 12 through ports 33 which place this chamber in communication with supply chamber-34.

The injector structure just described is known and need not be described herein in further detail. It is further to be understood that the injector` just described is shown for purposes of iliustration only and that insofar as the present invention is concerned, the injector structure may vary considerably.

Considering now more particularly the portion of the structure embodying the present invention, there is provided around the main steam nozzleY 18 an annular movable element 35 hereinafter referred to as a shroud, which operates to regulate the size of the opening through which water flows tothe water Vnozzle 20 from chamber 22. Inthe embodiment illustrated, the nozzle 18 is recessed forward of the joint 19 to provide an annular space 36 in which the cylindrical portion 35u-'of the shroud is slidably mounted. The forwardv portion of nozzle 18 is preferably prolvidedwith' an external cylindrical surface 18a: which provides a bearing for the forward portion 35h of the shroud. i

Free communication is advantageously provided between chamber 22 and space 44 between the shroud and nozzle 18 by means of one or more .ports 42 in the shroud, and space 44 is` also advantageously placed in communication with space 36 by means of" a suitable passage such as groove 43, which in the illustrated embodiment is in nozzle 18. Obviously chamber 22 and space 36 may be connected directly by a suitable passage in the casing.

Rotatably mounted in the casing portion 10 is the control member 37 having at its inner end an eccentrically disposed pin38 projecting into a suitable slot -in the shroud 35. Member 37 cornprises a stem 39 passing through a suitable packing gland 4G to the exterior of the casing portion 10 and having mounted thereon the operating handle 4l for turning the member 37.

The operation of the above described arrange'- ment to regulate the amount of water fed to the injector will be largely obvious from the drawing. In Fig. 1, shroud 35 is shown in fully retracted position with respect to the water nozzle 20, affording maximum opening for flow of water from chamber 22 into the water nozzle. The lower half of the shroud in Fig. 2 is shown in the same position as that shown in Fig. 1, while the upper half of the shroud in this figure is shown with the member 37 turned so that the shroud is moved as Vfar forward withrespect to the nozzle V20 as possible, thus affording the minimum opening from chamber 22 into the water nozzle. It will be evident that any desired intermediate size of water inlet opening may be obtained by turning the control lever 41 to move shroud 35 between the position of maximum opening shown in Fig. 1 and the position of minimum opening shown in the upper half ofFig. 2. Due to the free communication between spaces 36 and 44 and chamber 22, by way of port 4:2 and passage 43, rapid and easy movement of the shroud from a position such as that shown in the upper half of Fig. 2 to a position such as that shown in the lower half of the figure is not interfered with by water trapped in these spaces.

The Vusepf a movable element to vary the size ofthe water opening at the inlet of the water nozzle of the injector' is not new per se but heretofore this type of water regulation has been effected by the use of a movable steam nozzle.

By interposing between a fixed steam nozzle and the casing of the injector a movable shroud ofthe character just described, it is possible to retain theadvantages of water regulation at the water nozzle, which advantages Vare well known and neednotbe enlarged upon herein, while at the same time eliminating the disadvantages due to th e employment of a movable steam nozzle. It is highly important that the steam nozzle be very accurately centered with respect toy the water nozzle, and by employing a fixed steam nozzle, the highly desirable exact alignment of,

the steam and water nozzles may be maintained because of the fact that the steam nozzle is rigid and vis not subject to eventual misalignment due to wear as is the case when a sliding nozzle is employed. Furthermore, the employment of the xed nozzle precludes the possibility of leakage of steamfrom the steam chamber 12 around the outside of the steam nozzle and into the water chamber of the injector, thus avoiding undesirable heating of the water prior to its Contact With steam in the jet-forming nozzle. Likewise, the fixed and pressure tight joint between the steam nozzle and the casing of the injector precludes the leakage of water from the water chamber of the injector past the nozzle to the main steam chamber of the injector. This is important in thecase of injectors to which watervis supplied to the injector under pressure, as for example in boiler feed water apparatus wherein water is supplied to an injector from a boiler feed pump, the injector serving to heat and further elevate the pressure of the water supplied to it. When water is supplied to chamber 22 under pressure, port 42 and passage 43, which permit free flow of water and consequent equalization of pressure between this chamber and spaces 36 and 44, are of particular advantage.

It will be apparent to those skilled in the art that the present invention may be applied with equal facility and advantage to many different types of injectors and that insofar as the present invention is concerned, the pressure of the steam and also the character thereof (that is, whether live steam or exhaust steam) supplied to the steam nozzle is immaterial. Also it will be evident that the provision of nozzles such as the supplementary high pressure nozzle 31 and the secondary steam nozzle 23 may be omitted without affecting the present invention.

What I claim is:

l. In an injector, in combination, a casing providing aV steam chamber and a water chamber, a steam nozzle mounted in said casing between said chambers, a water nozzle mounted in said casing on the side of the water chamber remote from the steam chamber, said steam nozzle extending through said water chamber and having a cylindrical outei` surface adjacent to the water nozzle, a shroud aroundsaid steam nozzle, said shroud having a tapered outer` surface adjacent to said water nozzle and a cylindrical inner surface in sliding contact with the cylindrical outer surface o f said steam nozzle and means for moving said shroud axially of the steam nozzle to vary the inlet opening` for water between said nozzles.

2. In an injector, in combination, a main steam nozzle, a water nozzle spaced from the steam nozzle, ashroud around said steam nozzle, said shroud and said main Asteam nozzle havingaxially spaced cylindrical bearing. surfaces in sliding engagement-for guiding the shroud, said shroud Vhaving a portion adjacent to the inlet of said water nozzle for varying theinlet opening of the water nozzle upon movement of `lthe shroud and means for moving said shroud with respect to said steam nozzle.

3. In an injector, in combination, a casing havj.

lng spaced steam and water chambers, a steam nozzle fixed to the casing between said chambers and extending through said water chamber, a water nozzle fixed in the casing on the side of the water chamber remote from the steam chamber and a movable shroud slidably mounted at spaced places on said steam nozzle and radially spaced therefrom intermediate said spaced places whereby to provide an `annular space between the steam nozzle and the shroud, said annular space being located with-in said water chamber and means for moving said shroud to vary the area of the opening between said water chamber and said water'nozzle.

4^. In an injector, in combination, a casing hav- .,g

ing spaced steam and water chambers, a steam nozzle fixed to the casing between said chambers.

and extending through said water chamber, a water nozzle fixed in the casing on the side of the Water chamber remote from the steam cham- 3' ber and a movable shroud slidably mounted at spaced places on said steam nozzle and radially spaced therefrom intermediate said spaced places whereby to provide an annular space between the steamnozzle `and the shroud, said annular space being located within said water chamber and being in substantially open communication therewith and means for moving said shroudto vary the area of the opening between said water chamber and said water nozzle,

5. In an injector, in combination, a casing providing a steam chamber and a. water chamber, a steam nozzle mounted in said casing, a recess formed by adjacent wall portions of the steam nozzle and the casing, a water nozzle in communication with said water chamber, a shroud around said steam nozzle, said shroud comprising a portion slidably mounted in said recess and a portion adjacent said water nozzle for varying the inlet opening thereto upon movement of the shroud, said recess being in communication with said water chamber, and means mounted in said casing for moving said shroud.

6. In an injector, a casing, a main steam nozzle in said casing, a water nozzle in said casing, said nozzles being ixed in spaced relation to provide a water chamber therebetween in communication with the water nozzle, and means for regulating the rate of flow of water from said chamber comprising an annular member interposed between the main steam nozzle and the water nozzle and shiftable to alter the area for flow of water from said chamber to the water nozzle.

7. In an injector, a casing, a main steam nozzle in said casing, a water nozzle in said casing, said nozzles being fixed in spaced relation to provide a water chamber therebetween in communication with the water nozzle, and means for regulating the rate of ilow of water from said chamber comprising an annular member interposed between the main steam nozzle and the water nozzle, said annular member being movably mounted in said casing and having a portion maintaining contact with the exterior of said main steam nozzle in different positions of adjustment of said annular member, and means for moving said annular member with respect to the water nozzle to alter the area for ow of water from said water chamber.

8. In an injector, a casing, a main steam nozzle in said casing, a water nozzle in said casing, said nozzles being xed in spaced relation to provide a water chamber therebetween in communication with the water nozzle, and means for regulating the rate of ilow of water from said chamber comprising an annular member interposed between said nozzles, said annular member being movably mounted and having a portion for guiding all of the water from said water chamber into said water nozzle in different positions of adjustment of said annular member, and means for moving said annular member toward and away from the water nozzle to alter the area for flow of water from said water chamber.

9. In an injector, in combination, a casing, a main steam nozzle, a water nozzle, said nozzles being fixed in said casing in spaced relation to provide a water' chamber therebetween, said water chamber being in communication with said water nozzle, means for regulating the rate of ow of water from said water chamber comprising an axially movable shroud outside of said main steam nozzle for varying the area. for flow of water from said water chamber.

l0. In an injector, in combination, a casing providing a steam chamber and a water chamber, a main steam nozzle xed in said casing, a recess formed by adjacent wall portions of said main steam nozzle and said casing, a water nozzle fixed in said casing and in communication with said water chamber, means for regulating the rate of flow of water from said water chamber comprising a shroud around said main steam nozzle, said shroud comprising a portion slidably mounted in said recess and a portion adjacent to said water nozzle for varying the inlet opening thereto upon movement of the shroud, and means mounted in said casing for moving said shroud.

ll. In an exhaust steam injector, a casing providing a main exhaust steam chamber, a main exhaust steam nozzle xed in the casing and in communication with said chamber, a water nozzle fixed in the casing and spaced from the main exhaust steam nozzle to provide a water chamber, and means for regulating ilow of water from said water chamber to said water nozzle comprising an annular shroud slidably mounted in the casing between said main exhaust steam nozzle and said water nozzle.

12. In an exhaust steam injector, a casing providing a main exhaust steam chamber, a main j 1 exhaust steam nozzle xed in the casing and in communication with said chamber, a water nozzle xed in the casing and spaced from the main exhaust steam nozzle to provide a water chamber, and means for regulating ilow of water from said water chamber to said water nozzle comprising an annular shroud slidably mounted in the casing around said main exhaust steam nozzle and spaced therefrom to provide an annular space between the nozzle and the shroud, said main exhaust steam nozzle providing a xed partition between said shroud and said main exhaust steam chamber for preventing flow of steam from said chamber to said annular space.

13. In an injector, a casing providing a water chamber and a main steam chamber, said chambers being axially spaced in the casing, a main steam nozzle fixed in said casing between said chambers and extending axially across said water chamber, the fixed connection between the main steam nozzle and the casing preventing flow of uid between said chambers externally of the nozzle, and means for regulating the ow of water from said water chamber comprising an annular shroud slidably mounted in the casing around said main steam nozzle.

ERICH HENKEL. 

